KENNEDY SPACE CENTER, FLA. - Mission Specialist Piers J. Sellers, Ph.D., looks at the adjustable grapple bar on the SPACEHAB Oceaneering Enhanced Deployable box. The astronauts of the second Return to Flight mission, STS-121, were at the SPACEHAB facility in Cape Canaveral to participate in the Crew Equipment Interface Test (CEIT). This test allows the astronauts to become familiar with equipment they will be using on their upcoming mission. STS-121 is scheduled to launch in July aboard Space Shuttle Atlantis.